Most hacks on this site are pretty basic in nature, thanks to reader Galen we have something gearheads should enjoy.
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I've always loved Campy groups but most of my fleet is built with Shimano and SRAM. And who wants to purchase a dedicated set of wheels to run with the Campy groups? So I came up with a little hack to make my strictly Shimano-compatible freehubs & cassettes play nice with the Campy bikes: the Bici Mod spacer kit. You just add the spacers to your existing Shimano cassette and voila.
It's a lot less cost and hassle than swapping freehubs and buying Campy cassettes, and is both cleaner and cheaper than in-line adapters.
I've use this to run Dura-Ace cassettes on a Record race bike, Shimano 12-30 cassettes on Specialized 29er wheels on my Veloce-equipped 'cross bike, and a whole bunch of other combinations. Run the wheels you want with the group you want on the bike you want. Done.